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44 lines
1.5 KiB
44 lines
1.5 KiB
var uncurryThis = require('../internals/function-uncurry-this'); |
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var toObject = require('../internals/to-object'); |
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var floor = Math.floor; |
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var charAt = uncurryThis(''.charAt); |
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var replace = uncurryThis(''.replace); |
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var stringSlice = uncurryThis(''.slice); |
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var SUBSTITUTION_SYMBOLS = /\$([$&'`]|\d{1,2}|<[^>]*>)/g; |
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var SUBSTITUTION_SYMBOLS_NO_NAMED = /\$([$&'`]|\d{1,2})/g; |
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// `GetSubstitution` abstract operation |
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// https://tc39.es/ecma262/#sec-getsubstitution |
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module.exports = function (matched, str, position, captures, namedCaptures, replacement) { |
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var tailPos = position + matched.length; |
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var m = captures.length; |
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var symbols = SUBSTITUTION_SYMBOLS_NO_NAMED; |
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if (namedCaptures !== undefined) { |
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namedCaptures = toObject(namedCaptures); |
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symbols = SUBSTITUTION_SYMBOLS; |
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} |
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return replace(replacement, symbols, function (match, ch) { |
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var capture; |
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switch (charAt(ch, 0)) { |
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case '$': return '$'; |
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case '&': return matched; |
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case '`': return stringSlice(str, 0, position); |
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case "'": return stringSlice(str, tailPos); |
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case '<': |
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capture = namedCaptures[stringSlice(ch, 1, -1)]; |
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break; |
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default: // \d\d? |
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var n = +ch; |
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if (n === 0) return match; |
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if (n > m) { |
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var f = floor(n / 10); |
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if (f === 0) return match; |
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if (f <= m) return captures[f - 1] === undefined ? charAt(ch, 1) : captures[f - 1] + charAt(ch, 1); |
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return match; |
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} |
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capture = captures[n - 1]; |
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} |
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return capture === undefined ? '' : capture; |
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}); |
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};
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